28601789 has 4 divisors (see below), whose sum is σ = 28784124. Its totient is φ = 28419456.

The previous prime is 28601767. The next prime is 28601791. The reversal of 28601789 is 98710682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19096900 + 9504889 = 4370^2 + 3083^2 .

It is a cyclic number.

It is not a de Polignac number, because 28601789 - 2⁸ = 28601533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28601759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90932 + ... + 91245.

It is an arithmetic number, because the mean of its divisors is an integer number (7196031).

Almost surely, 2^28601789 is an apocalyptic number.

It is an amenable number.

28601789 is a deficient number, since it is larger than the sum of its proper divisors (182335).

28601789 is a wasteful number, since it uses less digits than its factorization.

28601789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182334.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 28601789 is about 5348.0640422493. The cubic root of 28601789 is about 305.8189546623.

The spelling of 28601789 in words is "twenty-eight million, six hundred one thousand, seven hundred eighty-nine".